Renal sinus disorders: imaging findings and pitfalls

Renal sinus pathology can be classified into 3 groups: intrinsic lesions th at arise from the anatomical components of the sinus (fatty tissue, collect ing system, arteries and veins, lymphatic vessels. and nerves); extrinsic l esions that develop within the renal sinus from the renal parenchyma; secon dary lesions including metastases and retroperitoneal tumors with renal sin us involvement. The diagnosis of renal sinus disorders often relies on a mu ltimodality approach including IVU, doppler-ultrasonography, and CT. The wi de variety of renal sinus diseases that may origin either from the renal pa renchyma or the retroperitoneum, and the numerous pitfalls mostly due to an atomic variations, may prevent from making a right etiological diagnosis in numerous cases.